batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
==================================================================
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
BUG: KASAN: use-after-free in tcp_orphan_retries net/ipv4/tcp_timer.c:127 [inline]
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:369 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0xa4b/0xa60 net/ipv4/tcp_timer.c:597
Read of size 4 at addr ffff8880a8e2c7e8 by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_load4_noabort+0x88/0x90 mm/kasan/report.c:432
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
tcp_orphan_retries net/ipv4/tcp_timer.c:127 [inline]
tcp_probe_timer net/ipv4/tcp_timer.c:369 [inline]
tcp_write_timer_handler+0xa4b/0xa60 net/ipv4/tcp_timer.c:597
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
tcp_write_timer+0x103/0x1b0 net/ipv4/tcp_timer.c:613
call_timer_fn+0x177/0x700 kernel/time/timer.c:1338
expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
__run_timers kernel/time/timer.c:1696 [inline]
run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709
__do_softirq+0x265/0x980 kernel/softirq.c:292
batman_adv: batadv0: Interface activated: batadv_slave_1
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x215/0x260 kernel/softirq.c:412
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 48 89 df e8 f4 20 7f f9 e9 2e ff ff ff 48 89 df e8 e7 20 7f f9 eb 82 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 14 43 4e 00 fb f4 90 e9 07 00 00 00 0f 00 2d 04 43 4e 00 f4 c3 90 90 41 56 41 55
RSP: 0018:ffff8880b5a9fd40 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3054 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880b5a86c44
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f18290
R13: 1ffff11016b53fb2 R14: 0000000000000000 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x49/0x310 arch/x86/kernel/process.c:557
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x2ec/0x4b0 kernel/sched/idle.c:263
cpu_startup_entry+0xc5/0xe0 kernel/sched/idle.c:369
start_secondary+0x435/0x5c0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Allocated by task 8138:
kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
kmem_cache_zalloc include/linux/slab.h:699 [inline]
net_alloc net/core/net_namespace.c:386 [inline]
copy_net_ns+0x106/0x340 net/core/net_namespace.c:426
create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107
unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206
ksys_unshare+0x36c/0x9a0 kernel/fork.c:2542
__do_sys_unshare kernel/fork.c:2610 [inline]
__se_sys_unshare kernel/fork.c:2608 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:2608
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 9428:
__cache_free mm/slab.c:3503 [inline]
kmem_cache_free+0x7f/0x260 mm/slab.c:3765
net_free net/core/net_namespace.c:402 [inline]
net_drop_ns+0x73/0x90 net/core/net_namespace.c:409
cleanup_net+0x64c/0x8b0 net/core/net_namespace.c:572
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
The buggy address belongs to the object at ffff8880a8e2c080
which belongs to the cache net_namespace of size 8704
The buggy address is located 1896 bytes inside of
8704-byte region [ffff8880a8e2c080, ffff8880a8e2e280)
The buggy address belongs to the page:
page:ffffea0002a38b00 count:1 mapcount:0 mapping:ffff88823b843e00 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880b5b46948 ffffea0002469308 ffff88823b843e00
raw: 0000000000000000 ffff8880a8e2c080 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a8e2c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a8e2c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a8e2c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a8e2c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a8e2c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 48 89 df mov %rbx,%rdi
3: e8 f4 20 7f f9 callq 0xf97f20fc
8: e9 2e ff ff ff jmpq 0xffffff3b
d: 48 89 df mov %rbx,%rdi
10: e8 e7 20 7f f9 callq 0xf97f20fc
15: eb 82 jmp 0xffffff99
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: e9 07 00 00 00 jmpq 0x28
21: 0f 00 2d 14 43 4e 00 verw 0x4e4314(%rip) # 0x4e433c
28: fb sti
29: f4 hlt
* 2a: c3 retq <-- trapping instruction
2b: 90 nop
2c: e9 07 00 00 00 jmpq 0x38
31: 0f 00 2d 04 43 4e 00 verw 0x4e4304(%rip) # 0x4e433c
38: f4 hlt
39: c3 retq
3a: 90 nop
3b: 90 nop
3c: 41 56 push %r14
3e: 41 55 push %r13